The largest common factor of two or more numbers is called the highest common factor (HCF) Setting out: Often, we set out the solution as follows: Example 9 Find the highest common factor of 14 and 28 Solution:

what is H.C.F.

The largest common factor of two or more numbers is called the highest common factor (HCF).

The common factors of 8 and 12 are in bold. So, the highest common factor is 4.

Setting out:

Often, we set out the solution as follows:

The HCF of 8 and 12 is 4.

Example 9

Find the highest common factor of 14 and 28.

Solution:

List the factors of 14 and 28.

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